/*
 * Copyright (c) 2023. The BifroMQ Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *    http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and limitations under the License.
 */

package com.baidu.bifromq.basekv.store.util;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.RejectedExecutionException;

public class ExecutorServiceUtil {
    public static CompletableFuture<Void> awaitShutdown(ExecutorService executor) {
        if (executor.isShutdown()) {
            return CompletableFuture.completedFuture(null);
        }
        CompletableFuture<Void> onDone = new CompletableFuture<>();
        try {
            executor.submit(() -> {
                onDone.complete(null);
            });
        } catch (RejectedExecutionException ree) {
            onDone.complete(null);
        } finally {
            executor.shutdown();
        }
        return onDone;
    }
}
